Makes instant run before unload listeners.

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 327 matching lines @@
   // to the foreground if necessary.
   void Activate();
 
   // Deactivates this contents by deactivating its containing window.
   void Deactivate();
 
   // TODO(brettw) document these.
   virtual void ShowContents();
   virtual void HideContents();
 
+  // Returns true if the before unload listener needs to be fired. The value of
+  // this changes over time. For example, if true and the before unload listener
+  // is executed and allows the user to exit, then this returns false.
+  bool NeedToFireBeforeUnload();
+
 #ifdef UNIT_TEST
   // Expose the render manager for testing.
   RenderViewHostManager* render_manager() { return &render_manager_; }
 #endif
 
   // Commands ------------------------------------------------------------------
 
   // Implementation of PageNavigator.
   virtual void OpenURL(const GURL& url, const GURL& referrer,
                        WindowOpenDisposition disposition,
@@ skipping 950 matching lines @@
   // Content restrictions, used to disable print/copy etc based on content's
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_